So based on this thread I drilled my muffler. Sounds a little better, but will be returning to stock. There's a slight "hum/drone" that is a bit annoying. May be I drilled holes too big?
Here is stock:
https://www.youtube.com/watch?v=h03dShxx1Xk
Drilled:
https://www.youtube.com/watch?v=fah0Jx_BQ08